Pipe-cutter



l. WJNONNEMAN.

PsPEcuUEn APPLICATION FILED FEB. al 1920.

Patented my 12, 1921..

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INVENTOR l. W. NONNENIAN.

' PIPE CUTTER.

I APPLICATION FILED FEB. 9, 1920. 1534,28; Patented July T12, 192k 2SHEETS-SHEET 2.

INVENTOR JW 20x )gw/1mm, i BY r 79M; @www IRA W. NONNEVIAN, 0F VTARREN,OHO, iSSG-NOR TO THE BRDEN COMPANY, 0F WARREN, OH'JO, A CORPORATEON OFOHO.

PEE-CTTER.

Specification of Letters Patent.

Patented July l2, i921.

Application led February 9, 1920. Serial No. 357,237.

To all whom t 77mg/ Concern.'

lle it known that l, lne. lll. ltlonnniimn, a citizen ot the UnitedStates, residing at llalarren, in the county of rlrumbull and State otOhio, 'have invented a er-tain new and useful improvement inldipe-Cutters, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings.,

rlhe object oi this'invention is to provide a simple and inexpensivepipe cutter adapted to operate e'liciently notwithstandingirregularities or inaccuracies in the surface ot the pipe. The cutter isof that type shown in my prior Patent #1,016,223 wherein there is acutting knife and a pipe guide mutually connected by an equalizinglever, so that a surface obstruction met by the guide as the tooltravels is compensated for by a deeper cut of the knite. rhere mayconveniently be two or' these equaliaed units on opposite sides or" thepipe, one of 'them being shiitable toward and Atrom the other tordifferent sized pipe and also to effect the feeding.

The particularjobjeet of the present invention isr to strengthen andrender more efficient, and at the same time simplify, the

equalizing connection between each guide and its knife, and theinvention comprises the means by which this is accomplisl ed, ashereinafter more fully explained and as summarized in the claims.

ln the drawings Figure l is a side elevation or" my pipe cutter; 2 is anedge view thereof, lfig. 3 is a sectional side elevation of tl Jrame andmeans for carryiiig and moving` the movable unit; Fig. l is a telescopicperspective illustrating the various y parts comprising` the equalizingunit.

,f-Ls'shown in lligs. l, 2 and 3, the traine oiE the pipe cuttercomprises two longitudiH nal bars l0 and l'l parallel with each otherand spaced apart and riveted or otherwise secured to stationary blocksl2 and i3, which extend between the bars at their opposite ends. rllheblock l2 carries one of the'guiding and' cutting units hereinafterdescribed and also has asocket le into which an operating handle' 15extends. The block 13 carries an internally threaded sleeve ll in whichis mounted a screw 2O operating the other guiding and cutting unit andserving also as a handle on that side.

`llidably mounted between the bars l0 and ll is a block 30 which carriesthe traveling cutting and guiding unit. This block has secured to itsouter edge a suitable strip 3l, which may be readily fastened by screws32 and extends across the bars l() and .ll to hold the block in place;the block having shoulders hereinafter mentioned slidably engaging theinner edges of the bars. @n this block 3U is a socket in which the inner end or the screw, 2() is swiveled; vas shown the screw has anannular groove 21 into which extends a set screw 22 threaded in thesocket wall.

The stationary block l2 and the movable block 30 carry their guiding andcutting units in substantially the same manner. The block l2 and itscooperating parts are shown speciically in Fig. 4t, where it will beseen that thisblock has ribs `d() on its opposite sides at the outeredges, and ribs ll, also on its opposite sides, in position to bearagainst n the inner edges of the bars l() and 11. Se-

cured t0 the tour ribs mentioned, are tour gibs 42 and i3 which overhangthe ribs t0- ward the intermediate portion ot the block. l have thusprovided undercut ways on opposite sides of the block 'for slidablyholding and guiding the knife carrier and pipe guide respectively.

rlhe knife is designated 50. lt is secured by screws 5l in a rabbetededge 52 of a block or carrier 53, which slides in the ways on one sideoi" the block 12; the pipe'guide 60 is secured to or 'formed integralwith, a platelike portion 63, which ll call a guide-carrier and whichslides in the ways on the other side of the plate l2. ln the plate l2 isa circular opening l5 ot considerable diameter, and occupying thisopening freely enough to readily turn therein is a disk 7i) which is ofonly slightly less thickness than the block l2. ln this disk arediametrically opposed notches 7l. rlhe kni'te block 53 carries a screwpin 55 which is thrcmled into it. and has a smooth cylindrical inwardlypro jecting portion occupying one oil? the notches 7l. The guide block63 carries a similar screw pin G5 which engages the other notch 7l.

lt will be seen that the notched disk 7() constitutes an equalizinglever connecting the knife carrier and guide carrier so that when eitheris pressed toward the handle l5 the other is automatically shoved towardthe pipe.

The cutting unit on the movable block 30 spondingly deeper cut into thepipe.

is identical to that described. for the stationary block l2; in otherwords, there is a knife 50L carried by sliding block 53l and a pipeguide 60a having shank block 63a, and these blocks and 63 carry thescrew pins 55l and (55L which engage diametric notches in disk '70anounted in a circular .opening in a plate 30.

rEhe guides for the inner and outer edges of the knife block and theguide block of the traveling unit are the same as described for thestationary end. it may be noted however, that the ribs corresponding tothe ribs 4:1" which carry gibs 43 (Fig. i) provide shoulders engagingthe inner edges of the frame bars l() and ll; these shoulders, togetherwith the plate 3l heretofore mentioned, serve to `slidably guide themovable head 30 along the frame bars.

In Fig. 1, have shown at A, a pipe being cut, in operation the screw 20is turned to cause the knives and guides to engage this pipe then thetool is rotated as a unit about the axis ofthe pipe; the screw beinggradually turned as the cutting proceeds to feed the knives fartherand'farther intov the pipe. The knives are preferably of that type whichhave in 'addition to their cutting points 58, opposed limiting shoulders59. in the ordinary operation the shoulder 59 is out of engagement withthe pipe; now if the guide meets an obstruction on the pipe, asfrequently happens due to the irregularities of the pipe surface, itsimply gives back slightly and theknife point takes a corre- The knifehowever, cannot go too deeply into the pipe, or hog it, as it is called,on account of the limiting shoulder on the knife; any such abnormalobstruction on `the pipe as would tend to cause this is taken care of byloosening the feed screw 20.

It will be seen that my equalizing connection between the knives andguides is of simple construction and does not increase the size of thetool. 'At the same time it possesses the desired strength to receive andtransmit the strains to which it is subjected.

I claim:

i. In a pipe cutter, the combination of a guide carrier, a knife carrierand intermediate member slidably supporting them, a rocking membercarried by the intermediate member and adapted to' turn about an axisextending across the knife carrier and guide supportingy membenand pinsconnecting the` rocking member on opposite sides of itsrocking axis withthe guide carrier and knife carrier respectively.

4. ln a pipe cutter, the combination of a supporting block having arecess, a rocker mounted in said recess, a guide carrier and a knifecarrier slidably mounted on oppo site sides of the supporting block,and` pins connecting the rocker with the guide carrier and knife carrierrespectively, said pins being each supported by one'of the members andextending into elongated openings in the other.

5. In a pipe cutter, the combination of a supporting block having arecess, a rocking block mounted in said recessv and having diametricallyopposed elongated openings therein, a guide carrier and a knife carrierslidably mounted on opposite sides of the supporting member, and pinscarried by the Aguide carrier and knifel carrier respectively andextending into the elongated openings in the rocking member.

6. in a pipe cutting tool, the combination with a supporting member of aknife carrier, a guide carrier, a notched rocking member carried bythesupporting member, and pins carried by the guide carrier and the knifecarrier respectively engaging the notch-es of said rocking member.

7. In a pipe cutter, the combination of the supporting block having acircular recess therein, a disk occupying said recess and having aplurality of notches therein, a guide carrier slidable on one side ofthe block, a knife carrier slidable on the otherV side of the block, andpins connecting theV disk withy the guide carrier and knife carrierrespectively, said pins being rigidly vcarried at one end by said guidecarrier and knife carrier respectively and occupying notches at theother end.

8. ln a pipe cutter, the combination of the supporting block having avcircular recess therein, a disk occupying said recess, and

having radial notches, a guide carrier slidable on one side of theblock, a knife carrier slidable on the other side ofthe block, and pinsscrew threaded in the guide 'carrier and knife carrier respectively andhaving their inner ends occupying said notches.

9. In a, pipe cutter, the combination of asupporting block, havingn arecessy e rocking member mennted in seid recess, 2L guideczirryingmember and knife-carrying member mounted on ,f-:eid supporting block,end inter-engaging Connections between the rocking membel1 and theguide-carrying member and between the rocking` membeil Lind' theknife-cirrying` member respectively, Seid intei-engaging connectionsbeing on opposite sides of the Vcenteix of ofseillzition of therockingmember and euch comprising a pin supported by one or seid membersand extending into un elongated opening in the cooperating member,whereby more Arent of the gnide-eerrying member1 in Vone directionproduces :i movemento'f the knife-carrying member in the oppositedirection.

l0. In a pipe cutter, the combination of a block having parallel sides,sind having a. circuler opening through it, e guide carrier slidziblyguided against the 'face of the block on one eide the openine, :i knifecarrier slidably guided on the other 'face oi the block opposite Saidopening, ai, disk monned in the oeeninu' and havin@ its neriihei r1 t l'freely engaging' the peripheral Well oit the opening and its; sidesadapted to freelv abut the knife carrier end guide carrier, sind disklaving dien etricelljfy opposed elongated openings and pins rigidlymounted in the guide carrier und knife carrier respectively' andoperating` in seid @longcitedk opening.

ln testimony WliereotJ l hereunto aiiix my signature.

IRA l/V.- NONNEMAN.

